MMC Navigation & Charting 3

Question 1

What is the primary purpose of a danger bearing?

Accepted Answer

To establish a bearing that must not be crossed to avoid a hazard

Answer

A danger bearing is a predetermined compass bearing to a fixed object; the navigator ensures the vessel stays on the safe side of this bearing to avoid a charted hazard.

Question 2

When using parallel rulers to transfer a course line to the compass rose, the transfer should always be made to the:

Accepted Answer

Inner ring of the compass rose for true courses

Answer

The outer ring of a chart's compass rose shows true directions referenced to geographic north, while the inner ring shows magnetic directions.

Question 3

Which chart scale is considered the largest scale for harbor navigation?

Accepted Answer

1:20,000

Answer

A scale of 1:20,000 (or smaller ratios like 1:10,000) is a large-scale chart showing fine detail suitable for harbor and port navigation.

Question 4

What action corrects for leeway when plotting a course to steer?

Accepted Answer

Adjust the course into the wind by the estimated leeway angle

Answer

Leeway is the sideways drift of a vessel caused by wind; the navigator compensates by steering upwind (into the wind) by the estimated leeway angle.

Question 5

A bearing of 000°T means the object is located:

Accepted Answer

Due north of the observer

Answer

A true bearing of 000° (or 360°) indicates the object is directly due north of the observer, as true bearings are measured clockwise from true north.

(MMC) Merchant Mariner Credential Practice Test

(MMC) Merchant Mariner Credential Practice Test

MMC Navigation & Charting 3